Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 2,847	$ 1,807	$ 2,474
Charged to Costs and Expenses	4,174	2,043	1,723
Charged to Other Accounts	(123)	(105)	(8)
Inventory write off	(4,059)	(898)	(2,382)
Balance at end of year	2,839	2,847	1,807
Valuation Allowance of Deferred Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	18,037	2,199	2,199
Charged to Other Accounts	(2,436)	16,674
Inventory write off	(2,183)	(836)
Balance at end of year	13,418	18,037	2,199
Inventory Valuation Reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	4,802	2,933	2,185
Charged to Costs and Expenses	815	2,204	779
Charged to Other Accounts	(249)	(181)	(25)
Inventory write off	(1,060)	(154)	(6)
Balance at end of year	$ 4,308	$ 4,802	$ 2,933